Materials Literature
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ABSTRACT Rates of lactose crystallization from solutions of constant alpha lactose concentration were determined at temperatures of 15–50°C. Commercially produced crystalline lactose was used as the seed material. Surface integration rather than diffusion of alpha lactose to the crystal surface was the rate controllin…
A wide variety of anodic oxide films were investigated from the photoluminescent point of view. It was found that the phenomenon of photoluminescence appears only on the films anodically formed in organic acids instead of inorganic acids. In particular, thick oxalic acid films formed in low electrolyte concentration,…
The hysteresis characteristics of stabilized Pb(Ti, Zr)3 ceramics are normally described by the introduction of an internal bias field. It is shown that the domain reversals are controlled by this field but that this field does not really exist inside the ceramic grains. A stabilization model describing the field dist…
Weight loss trials, potential'time, and potentiostatic polarisation curves have been used to study the inhibitive properties of zinc gluconate (ZnGl) towards the corrosion of mild steel in sea water. ZnGl completely protects mild steel in stagnant sea water at concentrations ≥ 1 × 10−3 mol/l; at concentrations between…
The applicability of a newly devised technique, based on the Wilhelmy principle, for measuring wetting properties of textile fibers has been demonstrated for a series of wood pulp fibers. The wettability of unbleached kraft, neutral sulfite semichemical (NSSC), and thermomechanical pulp fibers was determined and diffe…
Fine-grained PLZT and TiO2 ceramics subjected to applied electric fields can, depending upon composition and temperature, undergo disorder-order structural transformations that carry the materials from non-polar to polar structures. This paper proposes that the observed transformations are the result of crystallograph…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStereochemistry of carboxylate complexes. Crystal structure of (-)598-malatodiaquomanganese(II) hydrateAnastas. Karipides and A. Thomas. ReedCite this: Inorg. Chem. 1976, 15, 1, 44–47Publication Date (Print):January 1, 1976Publication History Published online1 May 2002Publis…
A magnetic study was done precisesly on single crystals of NdCo5 from a standpoint of the spin reorientation (SR). The easy axis rotates continuously from the b‐axis <10⋅0≳ at lower SR temperature (TSR1 at 245 K) to the c‐axis <00⋅1≳ at upper SR temperature (TSR2 at 285 K) in the bc‐plane. The temperature variations o…
A general theory is described for the evaluation of hysteresis and induction torques in rotating machines with unlaminated unslotted rotors using the concept of nonlinear complex permeability. Typical generalised characteristics derived for machines with either solid or tubular rotors show the influence of curvature a…
Four complexes of the bidentate chelating ligand 2-(2′-pyridyl)benzimidazole (pbim) are described: [Fe(pbim)3]-Br2; [Fe(pbim)3][NO3]2·OH2; and [Fe(pbim)3][ClO4]2·xOH2(x= 1 or 2). The complexes have been characterized by Mössbauer spectra (4.2–300 K), susceptibility measurements (80–310 K), solid-state (80–300 K) and s…
The emission, excitation and reflection spectra at 300, 80 and 13 K were obtained. For CaS:Bi 3+ , the green (515 mµ) and orange (588 mµ) emission bands are observed as well as the well-known blue (450 mµ) emission band at 300 K. CaSe:Bi 3+ shows blue-green (500 mµ) and red (645 mµ) emission bands at 80 K. CaO:Bi 3+ s…
Abstract In plastic crystals (“rotary phases”) there is a dynamic disorder of the orientations of the molecules. But reorientations can exist without disorder (jumps between equivalent orientations, e.g. benzene), and on the other hand frozen disorder can be found (exceptions to Nernst principle, e.g. CO). The rate of…
Whereas oxidation of 1-naphthols with Fremy's salt often affords significant amounts of the corresponding 1,2-naphthoquinone dye-sensitised photo-oxidation gives exclusively the 1,4-naphthoquinone via the addition of singlet oxygen to the naphthalene ring.
Two kinds of phase transitions are considered in the perovskite structure which involve instabilities located either at the Brillouin zone center (ferroelectric transition) or at the zone corners (antiferrodistortive transition). X-ray diffuse scattering and neutron inelastic scattering results are discussed. The stee…
The study of transient voltages in transformer windings has aroused interest recently with the presentation of more efficient methods of modelling. This paper presents a method of modelling the magnetic field of an air-core disk winding which has sections lumped together. Past methods have proved to be cumbersome and…
A single crystal of an Fe‐30wt%Cr‐23wt%Co−1wt%Si alloy was prepared by a recrystallization process.The magnetic properties of <100≳, <110≳ and <111≳ single crystals were measured after the following heat treatment. The crystals were solution‐treated at 1300°C for 30 min and then quenched into water. They were tempered…
Kinematical diffraction from a crystal having planar faults is described by a systematic writing of the Patterson function and its Fourier transform for the general case of an arbitrary number of different kinds of layer, describing the faults in terms of a fault vector plus an addition, or subtraction, of scattering…
This paper reports the results of an experimental investigation of the static field anode corona characteristics in SF6over a wide range of gas pressures and field non-uniformities. In addition to the experimental study the theoretical streamer onset voltages of the various test gap geometry-pressure configurations we…
The influence of Co-60 gamma-irradiation, up to 500 Mrad, on the kinetics of the thermal decomposition of lithium perchlorate has been studied over the temperature range 400–440°C. The material (m.p. 236°C) decomposes in the molten state and the lithium chloride formed remains dissolved initially but separates out as…
The Hall effect in the organic charge transfer compound HMTSeF-TCNQ was measured as function of temperature and pressure. The Hall constant indicates metallic behaviour near ambient temperature, and semi-metallic behaviour at low temperatures, with approximately one carrier per 500-1000 formula units. The Hall constan…